tarsnap warning on reading extended attributes

I am running tarsnap in a jail. I have it working, but my logs have lots of lines like the following:

Jan 17 16:37:01 tarsnap tarsnap: Backing up /mnt/git...
Jan 17 16:42:33 tarsnap tarsnap: Failed to back up "mnt/git"! (tarsnap: Couldn't list extended attributes: Permission denied
Jan 17 16:42:33 tarsnap tarsnap: tarsnap: Couldn't list extended attributesCouldn't list extended attributes: Permission denied
...

Jan 17 16:42:33 tarsnap tarsnap: tarsnap: Couldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attributesCouldn't list extended attrib

A few questions:

- why is it trying to read extended attributes?

- why is the formatting of the message strange? Looks like there is a missing newline.

- what is the recommended way to resolve this?

I am on FreeBSD 9.3-RELEASE-p28 using the tarsnap-1.0.36 binary package.

I thought there was something wrong with my jail setup, but apparently the inability to read extended attributes in the system name space is well-known. See http://lists.freebsd.org/pipermail/freebsd-jail/2012-May/001877.html.